//      key_4x4.h
//      Copyright 2011 mdchaparror <mdchaparror@gmail.com>
//      This program is free software; you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation; 
#ifndef _KEY_4X4_H_
#define _KEY_4X4_H_
#define key_on   PORTB &= ~0x01 //Activacion teclado
#define key_off   PORTB |= 0x01
#include <avr/io.h>
void key_enable();
void key_disable();
uint8_t key_read();	
#endif
